CN102740176A - Communication method and communication system - Google Patents
Communication method and communication system Download PDFInfo
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- CN102740176A CN102740176A CN2012102182537A CN201210218253A CN102740176A CN 102740176 A CN102740176 A CN 102740176A CN 2012102182537 A CN2012102182537 A CN 2012102182537A CN 201210218253 A CN201210218253 A CN 201210218253A CN 102740176 A CN102740176 A CN 102740176A
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Abstract
The embodiment of the invention discloses a communication method and a communication system which are applied in the technical field of communication. The communication method comprises the following steps that: a main passive optical network (PON) port sends a sampling main round-trip delay request to at least one optical network unit (ONU), and the local time of the main PON port is marked as a first main local time when a time mark fed back by the ONU is received; a standby PON port acquires the first main local time and the time mark fed back by the ONU to acquire a main round-trip delay, and the local time of the standby PON port is marked as a first standby local time when the time mark is acquired; the standby PON port calculates delay differences according to the first standby local time and the first main local time, and calculates the standby round-trip delay according to the delay differences and the main round-trip delay; and when the main PON port detects that a link is abnormal, the standby PON port communicates with the ONU according to the standby round-trip delay. The communication method and the communication system can ensure that the service interruption time is significantly reduced.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of communication means and communication system.
Background technology
Ethernet passive optical network (EPON, Ethernet Passive Optical Networks) is a kind of single fiber bi-directional Optical Access Network that a little arrives multipoint configuration that adopts, and its canonical topology structure is the tree type.The ethernet passive optical network system is by the optical line terminal (OLT of office's side; Optical Line Terminal), the optical network unit (ONU of user side; Optical Network Unit) and Optical Distribution Network (ODN, Optical Distribution Network) form.ODN is made up of Passive Optical Components such as optical fiber and one or more passive optical splitters, between OLT and ONU, optical channel is provided.At down direction, the signal that OLT sends arrives each ONU through ODN.Up direction adopts time division multiple access to insert (TDMA, Time Division Multiple Access) mode, and the signal that each ONU is sent is sent to OLT.Because the physical distance between each ONU and the OLT is unequal, need find range to the distance between each ONU and the OLT, then all ONU are adjusted to the signal that carries out the TDMA mode again in the logical place place identical with OLT and transmit; Can utilize the time tag distance-finding method, measure the round-trip delay (RTT, RONUd Trip Time) of each ONU earlier to OLT; For each ONU inserts a specific balanced time delay value, the RTT of all ONU after inserting balanced time delay value equated again, be equivalent to each ONU is adjusted to the logical place identical with OLT; The signal that just can carry out the TDMA mode transmits; The method of calculating RTT can be, OLT side direction ONU sends the acquired signal of sampling RTT, and this acquired signal has the timestamp of OLT side local zone time; When ONU receives this application that has timestamp; Local zone time and the timestamp of ONU is synchronous, and when ONU identified to the OLT feedback time, said time marking had timestamp; Local zone time of its indication ONU in feedback time sign constantly, the local zone time when RTT equaled OLT and received the ONU timestamp this moment deducts the time marking of ONU.
In order to improve network reliability and survivability, need protect trunk optical fiber, in the prior art; A master is set with EPON (PON, Passive Optical Networks) mouth and a subsequent use PON mouth at the OLT end, the master communicates with PON mouth and ONU; ONU can be received by subsequent use PON mouth to all data that OLT sends simultaneously; Detect when unusual with the PON mouth when main, switch to subsequent use PON mouth, because main fiber lengths possibility with PON mouth and subsequent use PON mouth correspondence is different; When switching to subsequent use PON mouth, subsequent use PON mouth needs find range to ONU again.
In the prior art again range finding can make service outage duration longer.
Summary of the invention
The embodiment of the invention provides communication means and the communication system that service outage duration is significantly reduced.
A kind of communication means; Comprise: the master sends the main application with round-trip delay of sampling with EPON mouth PON mouth at least one optical network unit ONU; Obtain the main round-trip delay of using; And when the master receives the time marking of said ONU feedback with the PON mouth, main local zone time with the PON mouth is labeled as the first main local zone time of using; Subsequent use PON mouth obtains the said first main local zone time of use, mainly use round-trip delay, and the time marking of ONU feedback, and when subsequent use PON mouth receives the time marking that said ONU feeds back, and the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time; Subsequent use PON mouth arrives main with PON mouth and the delay inequality that arrives subsequent use PON mouth based on the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time; And based on said delay inequality and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth, said subsequent use round-trip delay equals main and adds two times delay inequality with round-trip delay; Detect link when unusual when main with the PON mouth, subsequent use PON mouth communicates based on subsequent use round-trip delay and said ONU.
A kind of communication system; Comprise: main with passive optical network PON mouth and subsequent use PON mouth; Said master is used for sending the main application with round-trip delay of sampling at least one optical network unit ONU with the PON mouth; Obtain the main round-trip delay of using, and when the master receives the time marking of said ONU feedback with the PON mouth, main local zone time with the PON mouth is labeled as the first main local zone time of using; Said subsequent use PON mouth comprises: acquiring unit; Be used to obtain the said first main local zone time of using; And the time marking of ONU feedback; Obtain the main round-trip delay of use, and when subsequent use PON mouth receives the time marking that said ONU feeds back, the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time; Computing unit; Be connected with acquiring unit; Be used for based on arriving main with PON mouth and the delay inequality that arrives subsequent use PON mouth based on the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time; And based on said delay inequality and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth, said subsequent use round-trip delay equals main and adds two times delay inequality with round-trip delay; Communication unit is connected with computing unit, is used for communicating based on subsequent use round-trip delay and said ONU mouth.
In the technical scheme that the embodiment of the invention provides; In the main calculating of having accomplished subsequent use round-trip delay with PON mouth normal work period; Subsequent use PON mouth switches to the main state of using when the master is unusual with the PON mouth; Subsequent use PON mouth can directly carry out work according to subsequent use round-trip delay, and service outage duration is significantly reduced.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the communication means first embodiment sketch map in the embodiment of the invention;
Fig. 2 is the main with PON mouth work sketch map of communication means second embodiment in the embodiment of the invention;
Fig. 3 is the subsequent use PON mouth work sketch map of communication means second embodiment in the embodiment of the invention;
Fig. 4 is the distance-finding method sketch map of communication means second embodiment in the embodiment of the invention;
Fig. 5 is the subsequent use PON mouth structure sketch map of communication system first embodiment in the embodiment of the invention;
Fig. 6 is the communication system second example structure sketch map in the embodiment of the invention;
Fig. 7 is communication system the 3rd an example structure sketch map in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides communication means and communication system.Be elaborated respectively below
See also Fig. 1, communication means first embodiment comprises in the embodiment of the invention:
101, subsequent use passive optical network PON mouth is used round-trip delay to main with PON mouth application at least one optical network unit ONU of sampling and said main master with the PON mouth;
OLT side in the ethernet passive optical network system; In the OLT side master being set is used for communicating by letter with ONU with the PON mouth; And a subsequent use PON mouth is set to be used for when the master is unusual with PON mouth link, replacing the master to communicate by letter with ONU with the PON mouth; Master control borad connects main with PON mouth and subsequent use PON mouth, the main state of control with PON mouth and subsequent use PON mouth, and subsequent use PON mouth is used round-trip delay with PON mouth application at least one optical network unit ONU of sampling to the master of main PON mouth to the master with PON mouth normal work period the master.
102, the main PON of using mouth sends the main application with round-trip delay of sampling to said at least one ONU, and when the master receives the time marking of said ONU feedback with the PON mouth, main local zone time with the PON mouth is labeled as the first main local zone time of using;
After the application that receives subsequent use PON mouth, the main PON of use mouth sends the acquired signal that have t0 timestamp to ONU at the main local zone time that uses the PON mouth during as t0, and ONU is synchronized to the t0 moment with the local zone time of ONU after receiving this acquired signal; The local zone time of ONU is synchronized to t0 and picks up counting from t0; Preset the time delay, ONU identifies with the PON feedback time to main when the local zone time of ONU is t1, said time marking has the information of t1; This time marking is received with PON mouth and subsequent use PON mouth by main simultaneously; When the master received this time marking with the PON mouth, the master used the local zone time of PON mouth to be t2, and t2 is labeled as the first main local zone time of using.
103; Subsequent use PON mouth obtains said first master and uses local zone time, and the time marking of ONU feedback, obtains the main round-trip delay of using; And when subsequent use PON mouth receives the time marking of said ONU feedback, the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time;
The master notifies first master to subsequent use PON mouth with local zone time with the PON mouth; Subsequent use PON mouth obtains said first of the t2 that indicated and main use local zone time, and the ONU indication of directly sending the time marking of t1, mainly deduct t1 with PON mouth or subsequent use PON mouth according to t2 and calculate to lead and use round-trip delay; If this main round-trip delay that uses calculates gained for main with the PON mouth; Then the master notifies subsequent use PON mouth with the master that the PON mouth will calculate gained with round-trip delay, when the said master of said subsequent use PON mouth acquisition uses round-trip delay, subsequent use PON mouth to receive the time marking of said ONU feedback; The local zone time of subsequent use PON mouth is T1, and T1 is labeled as the first subsequent use local zone time.
104, subsequent use PON mouth arrive according to the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time main with PON mouth and the delay inequality that arrives subsequent use PON mouth, and according to said delay inequality and mainly calculate the subsequent use round-trip delay that ONU arrives subsequent use PON mouth with round-trip delay;
Subsequent use PON mouth receives the said first subsequent use local zone time according to said subsequent use PON mouth; And said first master is poor with the local zone time calculation delay; And according to said delay inequality and the main subsequent use round-trip delay that arrives subsequent use PON mouth with round-trip delay calculating ONU; The local zone time of said main use PON mouth and the local zone time spacing value at any time of subsequent use PON mouth are a constant or an available dynamic parameter; Promptly can learn the value at the local zone time of the subsequent use PON mouth of current time through the value of known master with the local zone time of PON mouth, spacing value described in the present embodiment is the constant D that presets; Then said time marking arrives and leads the delay inequality of using the PON mouth and arriving subsequent use PON mouth is that the first subsequent use local zone time deducts first master with local zone time and said spacing value, promptly
Delay inequality=T1-t2-D
Calculate ONU subsequent use round-trip delay to subsequent use PON mouth with main with round-trip delay according to said delay inequality, said subsequent use round-trip delay equals main and adds two times delay inequality with round-trip delay, promptly
Subsequent use round-trip delay=master is with round-trip delay+2* delay inequality.
105, detect link when unusual when main with the PON mouth, subsequent use PON mouth communicates based on subsequent use round-trip delay and said ONU mouth.
Detect link when unusual when main with the PON mouth; Master control borad is closed main optical module with the PON mouth; Open the optical module of subsequent use PON mouth, main state with the PON mouth is switched to stand-by state by main with state, and the state of subsequent use PON mouth is switched to the main state of using by stand-by state; Subsequent use PON mouth communicates according to subsequent use round-trip delay and said ONU mouth; Being specially according to the corresponding subsequent use round-trip delay of different ONU is specific balanced time delay of each ONU insertion, makes all ONU that delay when inserting equilibrium consistent with the round-trip delay of the subsequent use PON mouth of state to switching to the master, and ONU just can use the TDMA mode to subsequent use PON mouth transmission signal.
In the present embodiment; In the main calculating of having accomplished subsequent use round-trip delay with PON mouth normal work period; Subsequent use PON mouth switches to the main state of using when the master is unusual with the PON mouth; The process that subsequent use PON mouth can be found range, and directly carry out work according to subsequent use round-trip delay, service outage duration is significantly reduced.
See also Fig. 2, communication means second embodiment's is main with PON mouth work sketch map in the embodiment of the invention, comprising:
2101, the master powers on the PON mouth, and main local zone time with the PON mouth picks up counting with initial value from main after receiving the commutator pulse of at least one master control borad;
When the master powered on the PON mouth, the main local zone time with the PON mouth of initialization, the local zone time that makes the main PON of use mouth were the main initial value of using; And behind the main local zone time with the PON mouth of initialization, main local zone time with the PON mouth picks up counting with initial value from main after receiving the commutator pulse of at least one master control borad, and said commutator pulse is that master control borad whenever is separated by the commutator pulse cycle certain simultaneously to leading the pulse of sending with PON mouth and subsequent use PON mouth; In the present embodiment, said commutator pulse is pulse per second (PPS) (1PPS, 1Pulse Per Second); Promptly whenever be separated by and sent pulsatile once in one second, in other embodiment, said commutator pulse can also be pulse in two seconds; Or other blanking times are much larger than the commutator pulse of round-trip delay; When calculating, quote unit interval quantum (TQ, time quanta), 1TQ=16 nanosecond; Said round-trip delay learns that rule of thumb maximum is about 333333TQ; If greater than 333333TQ, then be regarded as blanking time much larger than round-trip delay said blanking time, said commutator pulse all sends with PON mouth and subsequent use PON mouth to main simultaneously.
2102; The master is in non operating state with the PON mouth after powering on; Dynamically detect valid data in bandwidth allocation (DBA, the Dynamically Bandwidth Assignment) authorization cycles continuously presetting Y, then main with PON mouth entering detected state; Execution in step 2103, otherwise keep non operating state;
In the present embodiment, said non operating state is meant that the master does not also begin to carry out link protection work with the PON mouth; Said link protection work comprises detected state and abnormality detection; Because after the master powered on the PON mouth, whole system possibly also not come into operation, if carry out abnormality detection this moment; The link that possibly lead with the PON mouth is normal; But report an error less than valid data owing to detecting, therefore main with the PON mouth when not beginning to carry out link protection work, the master is in non operating state earlier with the PON mouth;
The master is in non operating state with the PON mouth after powering on; The main valid data of sending with PON mouth detection ONU; If in continuous Y DBA authorization cycles, detect valid data; Then the master carries out next step with the PON mouth, in continuous Y DBA authorization cycles, detects valid data otherwise remain on non operating state always, and said DBA authorization cycles is the main cycle of regularly sending mandate with the PON mouth to ONU; Make ONU according to authorizing the gap to send signal to main with the PON mouth, said valid data are mainly to be used for the message that the PON mouthpiece carries with wrong after errorless after PON mouth or the verification of subsequent use PON mouth or the verification but master with what PON mouth or subsequent use PON mouth can be corrected voluntarily.
2103, the master is in detected state with the PON mouth, and the master detects valid data with the PON mouth in presetting Z continuous DBA authorization cycles, judge that then the master is normal with PON mouth link, the startup abnormality detection, and execution in step 2104, otherwise keep detected state;
The master is in detected state with the PON mouth; The main valid data of sending with PON mouth detection ONU; If in continuous Z DBA authorization cycles, detect valid data, judge that then the master is normal with PON mouth link, starts abnormality detection; Carry out next step, in continuous Z DBA authorization cycles, detect valid data otherwise remain on detected state always.
2104, the master is in the link normal condition with the PON mouth, starts abnormality detection; The master detects less than valid data in presetting M continuous DBA authorization cycles with the PON mouth; Judge that then the main PON of using mouth link is unusual, execution in step 2105, otherwise keep the link normal condition; If main under the normal state of link, receive at least one optical network unit ONU of application sampling that subsequent use PON mouth sends with the PON mouth and use round-trip delay to the master of main PON mouth, then execution in step 2106;
The master starts abnormality detection with the PON mouth under the normal state of link; The main valid data of sending with PON mouth detection ONU; If in continuous M DBA authorization cycles, detect less than valid data; Then judge main unusual with PON mouth link, execution next step, otherwise keep the link normal condition always and carry out the abnormality detection state and in a continuous N DBA authorization cycles, detect less than valid data.Said Y, the value of Z and M can be identical, also can be inequality, Y described in the present embodiment, the value of Z and M is inequality, and the master detects according to the DBA authorization cycles with the PON mouth, can more effective judgement link condition with respect to detecting with the time.
2105, main unusual with PON mouth link, send the link abnormal signal to master control borad;
Main unusual with PON mouth link, send the link abnormal signal to master control borad, after master control borad receives the link abnormal signal again; If subsequent use PON mouth link is normal; Master control borad is closed main optical module with the PON mouth, opens the optical module of subsequent use PON mouth, and main state with the PON mouth is switched to stand-by state by main with state; And the state of subsequent use PON mouth switched to by stand-by state mainly use state, subsequent use PON mouth communicates according to subsequent use round-trip delay and said ONU mouth.
2106, main send acquired signal and make subsequent use PON mouth obtain ONU and the main main round-trip delay of use to ONU, and first master of master when receiving the time marking that ONU feeds back with the PON mouth uses the time with the PON mouth with the PON mouth.
Lead with the PON mouth under the link normal condition; When receiving at least one optical network unit ONU of application sampling that subsequent use PON mouth sends main round-trip delay of using to main PON mouth; Then send acquired signal to ONU; Receive the time marking of ONU feedback, first master who receives this time marking is sent to subsequent use PON mouth with local zone time, making subsequent use PON mouth obtain main can be main main with local zone time and the said main round-trip delay of using of said time marking calculating according to first with PON mouth place with round-trip delay; Redispatch to subsequent use PON mouth; First master that also can obtain according to subsequent use PON mouth at subsequent use PON mouth place calculates said master with local zone time and time marking and uses round-trip delay, so that subsequent use PON mouth is used local zone time according to said first master, and time marking and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth.
See also Fig. 3, the subsequent use PON mouth work sketch map of communication means second embodiment in the embodiment of the invention comprises:
2201, subsequent use PON mouth powers on, and the local zone time of subsequent use PON mouth picks up counting from subsequent use initial value after receiving the commutator pulse of at least one master control borad;
When subsequent use PON mouth powers on, the local zone time of the subsequent use PON mouth of initialization, the local zone time that makes subsequent use PON mouth is subsequent use initial value; And behind the local zone time of the subsequent use PON mouth of initialization, the local zone time of subsequent use PON mouth picks up counting from subsequent use initial value after receiving the commutator pulse of at least one master control borad, and said commutator pulse is pulse in a second; Sent with PON mouth and subsequent use PON mouth to main by master control borad, said subsequent use initial value uses the difference of initial value to be C with main, and said C is a constant; Subsequent use PON mouth with main with the PON mouth after initialization; Can carry out synchronously with main local zone time with the PON mouth through the local zone time with subsequent use PON mouth, make that the subsequent use initial value and the difference of main use initial value are zero, promptly C equals 0; Also can obtain the master to the master with the application of PON mouth and use initial value, through calculating said difference C through subsequent use PON mouth.
2202, subsequent use PON mouth is in non operating state after powering on, and in first detection time of presetting, detects valid data, judges that then subsequent use PON mouth link is normal, and execution in step 2203, starts abnormality detection, execution in step 2204, otherwise keep non operating state;
In embodiments of the present invention, said non operating state is meant that subsequent use PON mouth does not also begin to carry out link protection work; Said link protection work comprises calculates subsequent use round RTT and abnormality detection, because after subsequent use PON mouth powered on, whole system possibly also not come into operation; The master possibly not start working with the PON mouth yet; If carry out abnormality detection this moment, the link of the subsequent use PON mouth of possibility is normal, but reports an error less than valid data owing to detecting; Therefore subsequent use PON mouth is in non operating state earlier when not beginning to carry out link protection work; Band detects certain valid data, and indication mechanism is normally operation, just finishes non operating state;
Subsequent use PON mouth is in non operating state after powering on; Subsequent use PON mouth detects the valid data that ONU sends, and said subsequent use PON mouth can receive the data that all ONU send, but can not send information to ONU; If in first detection time of presetting, detect valid data; Judge that then subsequent use PON mouth link is normal, start abnormality detection, carry out next step; Otherwise remain on detected state always and in first detection time of presetting, detect valid data; The value of said first detection time is equivalent to main with several continuous DBA authorization cycles of PON mouth, and the value of first detection time of then presetting is also relevant with the DBA authorization cycles, can more effective judgement link condition.
2203, subsequent use PON mouth is used round-trip delay with main with the main of PON mouth with at least one ONU of PON mouth application sampling to main, and calculates subsequent use round-trip delay;
Detect if main normal with PON mouth link; Then subsequent use PON mouth just often arrives the main round-trip delay of using of main PON mouth with at least one optical network unit ONU of PON mouth application sampling to the master at link; And obtain main first main with local zone time and obtain the said main round-trip delay of using when obtaining the time marking of said ONU feedback with the PON mouth; The first subsequent use local zone time when receiving the time marking of said ONU feedback based on said subsequent use PON mouth, and the data computation ONU that obtains is to the subsequent use round-trip delay of subsequent use PON mouth;
2204, subsequent use PON mouth is in the link normal condition, starts abnormality detection, in second detection time of presetting, detects less than valid data, judges that then subsequent use PON mouth link is unusual, and sends abnormality warnings, otherwise keep the link normal condition.
Subsequent use PON mouth starts abnormality detection under the normal state of link; Subsequent use PON mouth detects the valid data that ONU sends, if in second detection time of presetting, detect less than valid data, judges that then subsequent use PON mouth link is unusual; And send abnormality warnings; Be equivalent to the master said second detection time with several continuous DBA authorization cycles of PON mouth, said second detection time can be identical with first detection time, and first detection time and second detection time are inequality in the present embodiment; The said abnormality warnings of sending can be to send information to the employed main frame of O&M personnel, makes main frame send the unusual warning of the subsequent use PON mouth link of indication.
2205, master control borad obtains unusual solution signal, and carries out 2201 again.
The O&M personnel are after safeguarding or reselect main subsequent use PON mouth with PON mouth correspondence to subsequent use PON mouth; Send unusual solution signal to master control borad, master control borad obtains unusual solution signal, and subsequent use PON is salty newly to power on; Newly in first detection time of presetting, detect valid data if subsequent use PON is salty; Judge that then subsequent use PON mouth link is normal, use round-trip delay to main with PON mouth application at least one ONU of sampling and said main master again, and recomputate subsequent use round-trip delay with the PON mouth.
2206, if subsequent use PON mouth link is normal, main unusual with PON mouth link, master control borad carries out active and standby switching;
At subsequent use PON mouth link just often; If main unusual with PON mouth link, the master sends the link abnormal signal with the PON mouth to master control borad, after master control borad receives the link abnormal signal again; Master control borad is closed main optical module with the PON mouth; Open the optical module of subsequent use PON mouth, main state with the PON mouth is switched to stand-by state by main with state, and the state of subsequent use PON mouth is switched to the main state of using by stand-by state.
2207, switch to main subsequent use PON mouth and communicate based on subsequent use round-trip delay and said ONU mouth with state, switch to main subsequent use PON mouth and use the PON mouth as new master with state.
Switching to main subsequent use PON mouth with state communicates according to subsequent use round-trip delay and said ONU mouth; Be specially according to the corresponding subsequent use round-trip delay of different ONU and insert a specific balanced time delay for each ONU; Make all ONU that delay when inserting equilibrium consistent with the round-trip delay of the subsequent use PON mouth of state to switching to the master; ONU just can carry out the TDMA mode and send signal to switching to main subsequent use PON mouth with state, switches to main subsequent use PON mouth with state and uses the PON mouth as new master.
See also Fig. 4, the distance-finding method sketch map of communication means second embodiment in the embodiment of the invention comprises:
2301, after the master all powered on PON mouth and subsequent use PON mouth, subsequent use PON mouth obtained the main main initial value of using with the PON mouth to main with the application of PON mouth;
Main main in the back difference initialization that powers on the local zone time of PON mouth and the local zone time of subsequent use PON mouth with PON mouth and subsequent use PON mouth; The master is respectively main with initial value and subsequent use initial value with the local zone time of PON mouth and the initialized value of local zone time of subsequent use PON mouth; Subsequent use PON mouth obtains the main main initial value of using with the PON mouth to main with the application of PON mouth; And calculate subsequent use initial value and use the poor of initial value with the master, said subsequent use initial value is C with main difference with initial value, then obtains equality 1:
The subsequent use initial value of C=-master uses initial value
Said master picks up counting with initial value from main with PON mouth main local zone time with the PON mouth after receiving the commutator pulse of at least one master control borad; The local zone time of said subsequent use PON mouth subsequent use PON mouth after receiving the commutator pulse of at least one master control borad picks up counting from subsequent use initial value; Said commutator pulse is pulse in a second; Because the master not necessarily picks up counting with the local zone time of PON mouth and the local zone time of subsequent use PON mouth simultaneously, to establish the interval that picks up counting and be whole second, the local zone time of said main use PON mouth and the local zone time spacing value at any time of subsequent use PON mouth are that said C adds some seconds; When calculating with second the unit of being converted into be TQ; 1TQ=16 nanosecond equaled 62500000TQ in one second, obtained equality 2:
Local zone time-the master of (any time) subsequent use PON mouth is with the local zone time=spacing value=C+N*62500000TQ of PON mouth
Said N is an integer; In other embodiment; Can lead with behind the local zone time of PON mouth the local zone time of subsequent use PON mouth and the local zone time of leading with the PON mouth being carried out synchronously through obtaining through subsequent use PON mouth; Make the local zone time of subsequent use PON mouth all equate that with main local zone time promptly said spacing value is zero at any time with the PON mouth.
2302, be under the link normal condition with PON mouth and subsequent use PON mouth the master, subsequent use PON mouth is used round-trip delay to main with at least one ONU of PON mouth application sampling and main master with the PON mouth;
Be under the link normal condition with PON mouth and subsequent use PON mouth main, subsequent use PON mouth is used round-trip delay to main with at least one ONU of PON mouth application sampling and main master with the PON mouth.
2303, the master sends the main application of using round-trip delay of sampling with the PON mouth to said at least one optical network unit ONU, and when receiving the time marking of said ONU feedback, main local zone time with the PON mouth is labeled as the first main local zone time of using;
Main receive this application with the PON mouth after, send the acquired signal that have t0 timestamp to ONU at the main local zone time that uses the PON mouth during as t0, ONU is synchronized to the t0 moment with the local zone time of this ONU after receiving this acquired signal; And pick up counting from t0; Preset the time delay, ONU identifies with the PON feedback time to main when the local zone time of ONU is t1, said time marking has the information of t1; This time marking is received with PON mouth and subsequent use PON mouth by main; When the master received this time marking with the PON mouth, the master used the local zone time of PON mouth to be t2, and t2 is labeled as the first main local zone time of using.
2304, subsequent use PON mouth obtains said first and main use local zone time, and the time marking of ONU feedback, obtains the main round-trip delay of using, and when receiving the time marking that said ONU feeds back, and the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time;
The master notifies this first master to subsequent use PON mouth with local zone time with the PON mouth; Subsequent use PON mouth obtains the said first main local zone time of using of having indicated t2; And the ONU indication of directly sending the time marking of t1, mainly deduct t1 with PON mouth or subsequent use PON mouth according to t2 and calculate the main round-trip delay of use, if this main use round-trip delay for the master with PON mouth calculating gained; Then the master notifies subsequent use PON mouth with the master that the PON mouth will calculate gained with round-trip delay; It is said first main with local zone time and said main when using round-trip delay, subsequent use PON mouth to receive the time marking that said ONU feeds back that said subsequent use PON mouth obtains, and the local zone time of subsequent use PON mouth is T1; T1 is labeled as the first subsequent use local zone time; Said main use round-trip delay is at least one, if a plurality of ONU of application sampling to main the use round-trip delay of master with the PON mouth, then obtain the corresponding main round-trip delay of using of each ONU according to above-mentioned acquisition methods respectively; And calculate the corresponding subsequent use round-trip delay of each ONU in the computational process below respectively; Only the subsequent use round-trip delay that obtains single ONU is described in detail in the present embodiment, is sampled as under a plurality of situation in application and obtains the corresponding subsequent use round-trip delay of each ONU, repeat no more in the present embodiment with reference to the present embodiment method.
2305, subsequent use PON mouth arrives main with PON mouth and the delay inequality that arrives subsequent use PON mouth according to the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time;
Known equation 3:
Subsequent use round-trip delay-master is poor with round-trip delay=T* round-trip delay
Said subsequent use round-trip delay is meant the round-trip delay between subsequent use PON mouth and the ONU; When the fiber lengths of subsequent use PON mouth during greater than main fiber lengths with the PON mouth, to use round-trip delay, said T be 1 to subsequent use round-trip delay greater than leading; When the fiber lengths of subsequent use PON mouth equals main fiber lengths with the PON mouth; Subsequent use round-trip delay equals that main use round-trip delay, said T be 0, when the fiber lengths of subsequent use PON mouth during less than the fiber lengths led with the PON mouth; It is-1 that subsequent use round-trip delay is used round-trip delay, said T less than the master; The time marking of then said ONU feedback arrives and mainly equals half of round-trip delay difference with PON mouth and the delay inequality that arrives subsequent use PON mouth, and equality 4 is arranged:
Delay inequality=round-trip delay is poor/and 2
Equal at T under 1 the situation; Subsequent use PON mouth receives the moment of the time marking of said ONU feedback, and main local zone time with the PON mouth is equivalent to mainly receive behind the said time marking after a said delay inequality, when subsequent use PON mouth receives the time marking of said ONU feedback with the PON mouth; The local zone time of subsequent use PON mouth is the first subsequent use local zone time; When the master received said time marking with the PON mouth, the local zone time of main use PON mouth was that first master uses local zone time, and known with the spacing value of local zone time and subsequent use local zone time the synchronization master; Derive T under condition of different, obtain equality 5:
The first subsequent use local zone time=first is main with local zone time+spacing value+T* delay inequality
Then, obtain equality 6 according to the value of the spacing value of equality 2:
T* delay inequality=first subsequent use local zone time-first is main with local zone time-C-N*62500000
In existing PON systems organization distance, maximum round-trip delay required time then can obtain in the present embodiment much smaller than 62500000TQ; Lead usefulness or subsequent use round-trip delay and round-trip delay difference all much smaller than 62500000; The value in said commutator pulse cycle is one second, i.e. 62500000TQ is in other embodiment; Equal at T under 1 the situation; The first subsequent use local zone time is deducted the said first main difference with local zone time and said spacing value the commutator pulse cycle is got surplusly just can calculate delay inequality, analyze in the present embodiment T equal 1,0 with-1 o'clock situation; Then equality 6 two ends are added that 62500000 get surplusly again to 62500000, then obtain equality 7:
(the first subsequent use local zone time-first is main with the %62500000 of local zone time-C-N*62500000+62500000) for (62500000+T* delay inequality) %62500000=
Wherein % is for getting surplus number, establishes that (the first subsequent use local zone time-first is main with local zone time+C+N*62500000+62500000) %62500000 equals B
When T equals 1, delay inequality=B;
When T equaled 0, delay inequality equalled zero;
When T equals-1, delay inequality=62500000-B;
Calculate delay inequality.
2306, calculate ONU subsequent use round-trip delay to subsequent use PON mouth with main with round-trip delay based on said delay inequality;
Subsequent use PON mouth calculates ONU subsequent use round-trip delay to subsequent use PON mouth with main with round-trip delay according to said delay inequality, the delay inequality that calculates according to top step, and according to said equality 3 and equality 4, can obtain:
Subsequent use round-trip delay=master with round-trip delay+T* round-trip delay poor=main with round-trip delay+2*T* delay inequality
Calculate subsequent use round-trip delay.
Master control borad described in the present embodiment is connected with subsequent use PON mouth with the PON mouth with main; In other embodiment; Master control borad comprises and main first master control borad that is connected with the PON mouth and second master control borad that is connected with subsequent use PON mouth that first master control borad is netted through transmission with second master control borad and is connected, and said first master control borad and second master control borad are used for respectively to the master with PON mouth and subsequent use PON mouth transmission commutator pulse; Wherein first master control borad is used for detecting link with the PON mouth and closing the optical module of leading with the PON mouth when unusual main; Main state with the PON mouth is switched to stand-by state by main with state, and send handover information through the transmission net and give second master control borad, said second master control borad is used for when receiving said handover information; Open the optical module of subsequent use PON mouth, and the state of subsequent use PON mouth is switched to the main state of using by stand-by state.
In the present embodiment, leading the calculating of having accomplished subsequent use round-trip delay with PON mouth normal work period, subsequent use PON mouth switches to the main state of using when the master is unusual with the PON mouth; Subsequent use PON mouth just need not carry out ranging process, can directly carry out work according to subsequent use round-trip delay, and service outage duration is significantly reduced; And subsequent use PON mouth has the function of reporting an error, and it is unusual that master control borad can't be discerned subsequent use PON mouth link in the prior art, might under the unusual situation of subsequent use PON mouth link, carry out active and standby switching; Make service outage duration longer; Present embodiment is through carrying out abnormality detection to subsequent use PON mouth, makes subsequent use PON mouth can inform at once under the abnormality that the O&M personnel safeguard being in, and finds range again after solving abnormal problem again; Make system more stable; Effectively reduce service outage duration,, also can significantly improve so switch success rate owing to need when circuit is unusual, not find range again again.
See also Fig. 5, the subsequent use PON mouth structure sketch map of communication system first embodiment in the embodiment of the invention comprises:
Application unit 331 is used for to main with at least one ONU of PON mouth application sampling and the main main round-trip delay of using with the PON mouth;
Acquiring unit 332; Be connected with application unit 331, be used to obtain said first master and use local zone time, and the time marking of ONU feedback; Obtain the main round-trip delay of using; And when subsequent use PON mouth receives the time marking of said ONU feedback, the local zone time of subsequent use PON mouth being labeled as the first subsequent use local zone time, the said first main master when obtaining the time marking of said ONU feedback with the local zone time indication is main with the PON mouth is with the local zone time of PON mouth;
Computing unit 333; Be connected with acquiring unit 332; Be used for arriving main with PON mouth and the delay inequality that arrives subsequent use PON mouth according to the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time; And according to said delay inequality and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth, said computational process has detailed description in method embodiment, repeat no more at this;
Communication unit 334 is connected 333 with computing unit, is used for communicating according to subsequent use round-trip delay and said ONU mouth.
In the present embodiment; In the main calculating of having accomplished subsequent use round-trip delay with PON mouth normal work period; Subsequent use PON mouth switches to the main state of using when the master is unusual with the PON mouth; The process that subsequent use PON mouth can be found range, and directly carry out work according to subsequent use round-trip delay, service outage duration is significantly reduced.
See also Fig. 6, the communication system second example structure sketch map in the embodiment of the invention comprises:
With leading that master control borad 41 links together with PON mouth 42 and subsequent use PON mouth 43, wherein
Master control borad 41; Be used for detecting unusual and subsequent use PON mouth 43 links of link just often with PON mouth 42, close the optical module of leading with PON mouth 42, open the optical module of subsequent use PON mouth 43 main; Main state with PON mouth 42 is switched to stand-by state by main with state; And the state of subsequent use PON mouth 43 is switched to the main state, master control borad 41 use by stand-by state also be used for to main with PON mouth and subsequent use PON mouth transmission commutator pulse, said commutator pulse is pulse in a second;
Main with PON mouth 42; Be used for sending the main application of sampling with round-trip delay at least one optical network unit ONU; And when receiving the time marking of said ONU feedback; Main local zone time with the PON mouth is labeled as the first main local zone time of using, first master is sent to subsequent use PON mouth with local zone time, the master picks up counting with initial value from main with PON mouth main local zone time with the PON mouth after receiving the commutator pulse of at least one master control borad; Wherein the master also comprises with the PON mouth:
Main with detection module 421; Be used to detect the main state of valid data and control with PON mouth 42; And when the master is unusual with PON mouth 42 links, inform master control borad 41, after the master powers on PON mouth 42, in presetting Y continuously dynamic bandwidth allocation DBA authorization cycles, detect valid data; Then will lead and switch to detected state, otherwise keep off working state with PON mouth 42; After the main PON of using mouth 42 gets into detected states, in presetting Z continuous DBA authorization cycles, detect valid data, judge that then the master is normal with PON mouth 42 links, start abnormality detection, otherwise the maintenance detected state; After the main PON of using mouth 42 gets into abnormality detection, in presetting M continuous DBA authorization cycles, detect less than valid data, then judgement is main unusual with PON mouth 42 links, otherwise the maintenance abnormality detection;
Subsequent use PON mouth 43, the local zone time of subsequent use PON mouth picks up counting from subsequent use initial value after receiving the commutator pulse of at least one master control borad, and subsequent use PON mouth 43 comprises:
Acquiring unit 432 is connected with application unit 331, is used to obtain the said first main local zone time of using; And the time marking of ONU feedback; Obtain the main round-trip delay of use, and when receiving the time marking that said ONU feeds back, the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time;
Detecting unit 435 is connected with application unit 431, is used to detect valid data; The state of cut-in stand-by PON mouth switches to non operating state with subsequent use PON mouth after subsequent use PON mouth powers on, and in first detection time of presetting, detects valid data; Judge that then subsequent use PON mouth link is normal, switch to the link normal condition, and notice application unit is to the main main round-trip delay of using that arrives main PON mouth with at least one optical network unit ONU of PON mouth application sampling; At subsequent use PON link just often, if in second detection time of presetting, detect, judge that then subsequent use PON mouth link is unusual less than valid data; Subsequent use PON mouth is switched to abnormality; And send abnormality warnings, when obtaining unusual solution signal, subsequent use PON mouth is switched to non operating state.In the present embodiment, leading the calculating of having accomplished subsequent use round-trip delay with PON mouth normal work period, subsequent use PON mouth switches to the main state of using when the master is unusual with the PON mouth; Subsequent use PON mouth just need not carry out ranging process, can directly carry out work according to subsequent use round-trip delay, and service outage duration is significantly reduced; And subsequent use PON mouth has the function of reporting an error, and it is unusual that master control borad can't be discerned subsequent use PON mouth link in the prior art, might under the unusual situation of subsequent use PON mouth link, carry out active and standby switching; Make service outage duration longer; Present embodiment is through carrying out abnormality detection to subsequent use PON mouth, makes subsequent use PON mouth can inform at once under the abnormality that the O&M personnel safeguard being in, and finds range again after solving abnormal problem again; Make system more stable, effectively reduce service outage duration.
See also Fig. 7, communication system the 3rd example structure sketch map in the embodiment of the invention, in embodiments of the present invention on the basis of communication system second embodiment, further:
Communication system also comprises the transmission net 44 that is connected with master control borad 41; Wherein master control borad 41 comprises and leads first master control borad 411 that is connected with PON mouth 42 and second master control borad 412 that is connected with subsequent use PON mouth 43; Said transmission net 44 is connected with second master control borad 412 with first master control borad 411; Said first master control borad 411 and second master control borad 412 are used for sending commutator pulse to main with PON mouth 42 and subsequent use PON mouth 43 respectively; Wherein first master control borad 411 is used for detecting link with PON mouth 42 and closing the optical module of leading with PON mouth 42 when unusual main; Main state with PON mouth 42 is switched to stand-by state by main with state, and send handover information through transmission net 44 and give second master control borad 412, said second master control borad 412 is used for when receiving said handover information; Open the optical module of subsequent use PON mouth 43, and the state of subsequent use PON mouth 43 is switched to the main state of using by stand-by state.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to accomplish through program; This program can be stored in the computer-readable recording medium, and storage medium can comprise: read-only memory (ROM), random-access memory (ram), disk or CD etc.
More than communication means and communication system that the embodiment of the invention provided are described in detail; Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1. a communication means is characterized in that, comprising:
The main EPON mouth PON mouth of using sends the main application with round-trip delay of sampling at least one optical network unit ONU, and when the master receives the time marking of said ONU feedback with the PON mouth, main local zone time with the PON mouth is labeled as the first main local zone time of using;
Subsequent use PON mouth obtains the said first main local zone time of using; And the time marking of ONU feedback; Obtain the main round-trip delay of use, and when subsequent use PON mouth receives the time marking that said ONU feeds back, the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time;
Subsequent use PON mouth arrives main with PON mouth and the delay inequality that arrives subsequent use PON mouth based on the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time; And based on said delay inequality and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth, said subsequent use round-trip delay equals main and adds two times delay inequality with round-trip delay;
Detect link when unusual when main with the PON mouth, subsequent use PON mouth communicates based on subsequent use round-trip delay and said ONU.
2. based on the described communication means of claim 1, it is characterized in that said master also comprised before at least one optical network unit ONU is sent the main application with round-trip delay of sampling with EPON mouth PON mouth:
Subsequent use PON mouth is used round-trip delay to main with PON mouth application at least one ONU of sampling and said main master with the PON mouth.
3. communication means according to claim 1; It is characterized in that; Saidly detect link when unusual when main with the PON mouth, subsequent use PON mouth communicates specifically according to subsequent use round-trip delay and said ONU mouth and comprises: detect link when unusual when leading with the PON mouth, master control borad is closed the optical module of leading with the PON mouth; Open the optical module of subsequent use PON mouth; Main state with the PON mouth is switched to stand-by state by main with state, and the state of subsequent use PON mouth switched to lead by stand-by state use state, subsequent use PON mouth communicates according to subsequent use round-trip delay and said ONU mouth.
4. communication means according to claim 1; It is characterized in that said method also comprises: after the master powers on the PON mouth, in presetting Y continuously dynamic bandwidth allocation DBA authorization cycles, detect valid data; Then main with PON mouth entering detected state, otherwise keep non operating state;
Main with behind the PON mouth entering detected state, in presetting the individual continuous DBA authorization cycles of Z, detect valid data, then judgement is main normal with PON mouth link, startup abnormality detection, otherwise maintenance detected state;
Main with after the PON mouth entering abnormality detection, detection is judged that then the master is unusual with PON mouth link, otherwise is kept abnormality detection less than valid data in presetting M continuous DBA authorization cycles.
5. based on the described communication means of claim 2, it is characterized in that said subsequent use PON mouth also comprises with before the round-trip delay to the master of main PON mouth with at least one ONU of PON mouth application sampling to main:
After subsequent use PON mouth powers on; In first detection time of presetting, detect valid data; Judge that then subsequent use PON mouth link is normal; Otherwise maintenance non operating state, said subsequent use PON mouth link are just often used round-trip delay to main with PON mouth application at least one ONU of sampling and said main master with the PON mouth.
6. communication means according to claim 5 is characterized in that, subsequent use PON mouth link just often detects less than valid data in second detection time of presetting, and judges that then subsequent use PON mouth link is unusual, and sends abnormality warnings.
7. communication means according to claim 6 is characterized in that, also comprises after sending abnormality warnings:
Master control borad obtains unusual solution signal; Newly in first detection time of presetting, detect valid data if subsequent use PON is salty; Judge that then subsequent use PON mouth link is normal, use round-trip delay to main with PON mouth application at least one ONU of sampling and said main master again with the PON mouth.
8. according to each described communication means in the claim 1 to 7, it is characterized in that said method also comprises: said master picks up counting with initial value from main with PON mouth main local zone time with the PON mouth after receiving the commutator pulse of at least one master control borad;
The local zone time of said subsequent use PON mouth subsequent use PON mouth after receiving the commutator pulse of at least one master control borad picks up counting from subsequent use initial value; Said commutator pulse is that master control borad whenever is separated by the commutator pulse cycle certain simultaneously to main pulse of sending with PON mouth and subsequent use PON mouth.
9. communication means according to claim 8 is characterized in that, said commutator pulse is pulse per second (PPS) 1PPS.
10. communication means according to claim 9 is characterized in that, said subsequent use initial value uses the difference of initial value to be C with main, and said C is a constant.
11. communication means according to claim 1; It is characterized in that; The local zone time of main use PON mouth and the local zone time spacing value at any time of subsequent use PON mouth are to preset constant, and said subsequent use PON mouth specifically comprises with the main delay inequality with PON mouth and subsequent use PON mouth of time marking arrival that local zone time calculates said ONU feedback according to the said first subsequent use local zone time and said first master:
The first subsequent use local zone time is deducted said first master obtain delay inequality with local zone time and said spacing value.
12. communication means according to claim 10; It is characterized in that; The local zone time of said main use PON mouth and the local zone time spacing value at any time of subsequent use PON mouth are that said C adds some commutator pulse cycles; Said subsequent use PON mouth is according to the said first subsequent use local zone time, and said first master specifically comprises with the main delay inequality with PON mouth and subsequent use PON mouth of time marking arrival that local zone time calculates said ONU feedback:
The first subsequent use local zone time is deducted said first main with the difference of local zone time and said spacing value the commutator pulse cycle is got surplusly, obtain delay inequality.
13. a communication system is characterized in that, comprising:
Main with passive optical network PON mouth and subsequent use PON mouth; Said master is used for sending the main application with round-trip delay of sampling at least one optical network unit ONU with the PON mouth; And when the master receives the time marking of said ONU feedback with the PON mouth, main local zone time with the PON mouth is labeled as the first main local zone time of using;
Said subsequent use PON mouth comprises:
Acquiring unit; Be used to obtain said first master and use local zone time, and the time marking of ONU feedback, the main round-trip delay of using obtained; And when subsequent use PON mouth receives the time marking of said ONU feedback, the local zone time of subsequent use PON mouth is labeled as the first subsequent use local zone time;
Computing unit; Be connected with acquiring unit; Be used for arriving main with PON mouth and the delay inequality that arrives subsequent use PON mouth based on the said first subsequent use local zone time and the said first main time marking that calculates said ONU feedback with local zone time; And based on said delay inequality and main with the subsequent use round-trip delay of round-trip delay calculating ONU to subsequent use PON mouth, said subsequent use round-trip delay equals main and adds two times delay inequality with round-trip delay;
Communication unit is connected with computing unit, is used for communicating according to subsequent use round-trip delay and said ONU mouth.
14. communication system according to claim 13 is characterized in that, said subsequent use PON mouth also comprises:
The application unit is used for to main with PON mouth application at least one ONU of sampling and the said main main round-trip delay of using with the PON mouth;
Detecting unit is connected with the application unit, is used to detect valid data; And the state of cut-in stand-by PON mouth; After subsequent use PON mouth powers on subsequent use PON mouth is switched to non operating state, in first detection time of presetting, detect valid data, judge that then subsequent use PON mouth link is normal; Switch to the link normal condition, and notice application unit is used round-trip delay with PON mouth application at least one optical network unit ONU of sampling to the master of main PON mouth to main.
15. communication system according to claim 14 is characterized in that, said detecting unit is further used for just often detecting valid data at subsequent use PON link; If in second detection time of presetting, detect less than valid data; Judge that then subsequent use PON mouth link is unusual, subsequent use PON mouth is switched to abnormality, and send abnormality warnings; When obtaining unusual solution signal, subsequent use PON mouth is switched to non operating state.
16. according to claim 13; 14 or 15 described communication systems; It is characterized in that; Said communication system also comprise main with the PON mouth and with the main master control borad that is connected with subsequent use PON mouth with the PON mouth, said master control borad is used for detecting link with the PON mouth and closing main optical module with the PON mouth when unusual leading, and opens the optical module of subsequent use PON mouth; Main state with the PON mouth is switched to stand-by state by main with state; And the state of subsequent use PON mouth switched to by stand-by state mainly use state, also be used for sending commutator pulse with PON mouth and subsequent use PON mouth said mainly pick up counting with initial value from the master with the local zone time of PON mouth with PON mouth master after receiving the commutator pulse of at least one master control borad to main; The local zone time of said subsequent use PON mouth subsequent use PON mouth after receiving the commutator pulse of at least one master control borad picks up counting from subsequent use initial value.
17. according to claim 13; 14 or 15 described communication systems is characterized in that, said communication system also comprises the main PON mouth of using; Master control borad and the transmission net that is connected with master control borad; Said master control borad comprises and main first master control borad that is connected with the PON mouth and second master control borad that is connected with subsequent use PON mouth that said transmission net is connected with second master control borad with first master control borad, and said first master control borad and second master control borad are used for respectively to leading with PON mouth and subsequent use PON mouth transmission commutator pulse; Wherein first master control borad is used for detecting link with the PON mouth and closing the optical module of leading with the PON mouth when unusual main; Main state with the PON mouth is switched to stand-by state by main with state, and send handover information through the transmission net and give second master control borad, said second master control borad is used for when receiving said handover information; Open the optical module of subsequent use PON mouth, and the state of subsequent use PON mouth is switched to the main state of using by stand-by state.
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